Let-off motion for looms.



I. GOULOMBE.

LET-OFF MOTION FOR Looms.

E APPLIOATION FILED PEB.8, 1913.

Patented May 20, 1913.

INVENTOR [aw/765C001 owner WITNESSES 14 d. 2.5 M

ATTORNEYS and arms13 and 1% is journaled on the i IGNACE COULOMBE, OF FALL RIVER, MASSACHUSETTS.

LET-OFF MOTION FOR LOOIVIS.

Specification of Letters Patent.

Application filed February 8, 1913.

Patented May so, ieis.

5erial No. 747,099.

To all whom it may concern Be it known that I, IGNA-CE Connemara, a citizen of the United States, and a resident of Fall River, in the county of Bristol and State of li'lassaehusetts, have invented a new and useful Improvement in Let-0ft Motionsfor Looms, of which the following is a specification.

My invention is an improvement in let-cit motions for looms, and has for its object the provision of a device of thecharacter specified, wherein the tension on the warp beam is controlled by the weight of the yarn on the beam,.a11d wherein the arrangement is such that the said weight acts upon both ends. of the brake band to tighten the same to regulate the tension thereof.

In the drawings :F igure 1 is an end view; of a portion of the loom provided with the improved let-elf motion, a part of the loom frame being broken away, Fig. 2 is a front view of the same, Fig. 3 1s a perspective view ofthe support for the beam. and Fig. 4 is a section on the line 4-4 of Fig. 3. i In the present embodiment of the invention, the spindle 1 of the warp beam 2 rests in a bearingrecess 3, near one end of a hearing lever 4;, pivoted intermediate its ends as indiated at 5 to a bracket 6, supported on the frame 7 of the loom. Thqbearing recess 3, fort-he spindle is adjacentato, the pivotal support .5 of the lever, and :igbfhke disk 8 is atthe end of the beam adjacent to the said lever. The brake band or chain 9 may be of any desired construction, as for in stance, composed of links 10, each'having an insert 11 of cork or the like, the inner faces ofthe inserts engaging the periphery of the. brake disk.

An elbow lever consisting of av spindle 12 bracket 6, before mentioned, the spindle 12 being journaled in an opening in the bracket. One end of the brake chain 9 is connected with the arm 14 and a link 15 connects the other arm 13 with the end of indicated at 22, and the said lever is pivoted at.- 23 to a plate 2%, supported on the frame of the loom. A second lever '25 is pivoted at. 26 to the said plate, and the op- 0 posite end of the lever 25 is provided with an opening 27, in which is engaged one end of a chain 28, the other end of the chain being engaged with an opening 29 in that end of the lever 4 remote from the spindle of the warp beam. The lever 25 is also longitudinally slotted as indicated at 30. I It will be noted from an inspection'of Figs. 2 and 3 that the lever-20 is pivoted to the plate 2st at the and adjacent to the brake band, while the lever 25 is pivoted at the end remote from the brake band, and the levers are arranged alongside each other, so that the slots 22 and 30 cross each other as shown. for pivotally connecting the lovers, the said bolt having an annular rib 32 intermediate its end and one end of the bolt is threaded as indicated at 31, and is engaged by a nut 3;, a washer 35 being arranged between the net and the lever The rib 32 is as be fore stated, arranged between the levers, so that each end of the bolt engages a slot 22 or 30 and the bolt may be clamped to the lever 25 by nieansof the nut 34. The bolt may be adpisted 1n the slots to vary the,-

leverage exerted, by loosening the nut 53% and shifting the bolt. It will be noticed that the lever 25 is offset laterally at the end adjacent to the chain 28 in order to prevent.

interference with the wing nut 21 and the lever .20.

1 In. operation, the tension upon the brake V band or chain 9 is adjusted by means the bolt 31, and when the proper tension is obtained, the device is ready for operation.

It is obvious that as the warp 36 passes elf the warp beam, the beam will become hghteryand 1t 'Wlll' be also obvious that the beam mustmove fastertesupply the proper 10 amount of yarn, since the entire diameter of the beam and the yarn thereof decreases The weightof the beam and the yarn is .supportedby the inner end of the lever 4:, i and the said weight tends to swing the elbow 1 le er 12, 13, 14 in a direction to tighten the brake hand on the brake disk. The weight of the beam tends to swing theouter end of the lever 4 upward to raise the free end of the lever 25, and to, raise that end of the lever 20 remote fromthe rod 16, whereby to pull the said red downward to make ten- A headless bolt is provided 75 sion on the other end of thebrake band or chain. In other Words the greater the weight of the beam and the yarn thereon the greater will be the tension on the brake band and the said tension is exerted at both ends of the band instead of at one end so that the said tension is uniform throughout that portion of the length of the band that contacts with the periphery of the brake disk. As the beam yields, the weight on the lever i relaxes, and the said lever tends to swing in such a manner as to relax the tension on both ends of the brake band.

It will be noted that the opening in the extension 19 of the lever 20 through which the threaded end of the rod 16 passes is slotted, the opening being in fact a recess to permit the removal of the rod 16, to release the warp beam without unthreading 20 i the rod.

I claim 1. The combination with the loom and the Warp beam having a brake wheel at one end, of a lever pivoted intermediate its ends to the frame of the loom and having a bearing recess at the inner side of the pivot for receiving the adjacent spindle of the warp beam, an elbow lever pivoted to the frame below the lever, a link connecting one of the arms of the elbow lever with the inner end of the bearing lever, a brake band encircling the wheel and having one of its ends connected with the other arm of the elbow lever, a rod connected at one end with the other end of the band and having its other end threaded, a lever pivoted to the frame of the loom near one end and having an opening at the end adjacent to the pivot for receiving the rod, a nut threaded on to the rod below the lover, a second lever arranged adjacent to the first-named lever and pivoted to the loom frame at the end remote from the brake wheel, a chain connccting the free end of the last-named lever to the bearing; lever at theopposite end from the bearing recess, each of the said levers having a longitudinal slot, a headless bolt engaging the slots of the two levers and having an annular rib between the levers, the outer end of the bolt being threaded, and a nutengaging the said end for clamping the bolt to the lever.

2. The combination with the loom and the Warp beam having a brake wheel at one end, of a lever pivoted intermediate its ends to the frame of the loom and having a bearing;- recess at the inner side of the pivot for receiving the adjacent spindle oi the warp beam, an eibow lever pivoted to the frame below the lever, a link connecting on of the arms of the elbow lever with the inn r end of the bearing lover, a brake band encircling the wheel and-having" one of' its ends connected with the other arm of the elbow lever, a rod connected at one end with the other end of the band and having itsnection between the outer end of the bearing lever and the free end of the other of the last-named levers.

3. The combination with the loom and the warp beam thereof, of a lever pivoted intermediate its ends to the loom and having a bearing recess at the inner side of the pivot for receiving the adjacent spindle of the warp beam, a brake chain or band engaging the beam,-an elbow lever pivoted to the loom, a link connecting" one of the arms of the elbow lever with the inner end of the bearing lever, the other arm of the elbow lever being connected to one end of the brake band, a pair pi levers arranged alongsid each other and pivot-ed at opposite ends to the loom, one 01 the levers being extended beyond its pivotal connection and having an adjustable connection with the other end of the brake band, a pivotal connection between the levers intermediate their ends, said connection being, adjustable with respect to the levers, and a connection between the outer end of the bearing lever and the free end of the other lever of the pair.

a. The combination with the loom and the warp beam thereof, of a bearing lever for the beam, said lever bemg pivoted to the frame intermediate its ends, a brake chain or band engaging the beam, an elbow lever pivoted to the loom and having one of its arms connected to one end of the band, a connection between the other arm and the ios end of the bearing lever adjacent to the beam, a. pair of lovers arranged alongside each other, said levers being pivoted to the loom frame at their opposite ends, a con. nection between the free end of one lever and the end of the bearing lever remote the beam, an adjustable pivotal connection between the lever intermediate their ends, the other lever being extended beyond its pivot at one end; and an adjustable connection between the extended and and the other end of the brake chain.

5. Qlhe combination with the loom and the the weight of the beam, levers pivoted at one end to the loom, said levers being oppositely arranged and lying alongside each other, a pivotal connection between the levers intermediate their ends, said connection being adjustable with lever and the other end of the bearing lever, the other lever being extended beyond its pivot, and an-adinstable connection between the extension of the lever and the other end of the brake band. 5. The combination with the loom and the warp beam, of a lever pivoted intermediate its endsto the loom, the beam resting on the lever on one side of the pivotal connection, abrake band for the-beam, a connection be- 7 tween one end of the bearing lever and-one end of the band for tightening the said band when the lever end is pressed downward by the weight. of the beam, and a connection between the other end of the bearin lever and the other end of the brake band or making tension on the said end of the brake band when the said other end of the bearing lever moves upward.

7. The combination with theloom and the warp beam, of a lever pivoted intermediate its ends tothc loom, and supporting the adjacent end of the warp beam on one side of respect to the levers, a connection between the free end of one ward by the weight of the warp beam, a con-- nection between the other end of the bearing lever and the other end of the brake ban for making tension on the said end 6f the brake band when the said lever end moves upward, said connection being adjustable to vary the tension exerted.

8. The combination with the loom and the warp beam having a brake wheel at one end thereof and the brake band passing over the wheel, of a lever pivoted intermediate its ends to the loom and for the adjacent end of the warp beam on one side of its pivotal connection, and a conmotion between each end of the lever and the adjacent end of the brake band for malt-- mg tension on both ends of the band in accordance with the weight of the beam.

IGNAGE COULOMBE.

Witnesses: A

ERNEST LEVASSEUR, HENRI Sr. Once.

having a support 

